[nnc] Test for using int64 dimensions (#54094)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/54094
We should be able to use 64-bit integers for loop boundaries and
buffer/tensor indexing.
ghstack-source-id: 124116846
Test Plan: New tests, disabled
Reviewed By: ZolotukhinM
Differential Revision: D27094934
fbshipit-source-id: a53de21a0ef523ea3560d5dd4707df50624896ef
